Water is sent from a fire hose at 40 m/s at an angle of 30° above the horizontal. What is the maximum height reached by the water?
a. 7.5 m
c. 15 m
b. 11 m
d. 20 m
D
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A piece of dirt falls from the bed of a moving truck. It strikes the ground directly below the end of the truck. (a) What is the direction of its velocity relative to the truck just before it hits? (b) Is this the same as the direction of its velocity relative to ground just before it hits? Explain your answers.
a. The velocity of the dirt is backward relative to the truck just before it hits the ground, (b) The velocity of the dirt is backward relative to the ground just before it hits the ground, b. The velocity of the dirt is backward relative to the truck just before it hits the ground, (b) The velocity of the dirt is forward relative to the ground just before it hits the ground, c. The velocity of the dirt is forward relative to the truck just before it hits the ground, (b) The velocity of the dirt is leftward relative to the ground just before it hits the ground,
A red apple will appear black when illuminated with
A) blue light. B) cyan light. C) yellow light. D) magenta light. E) none of the above
Change in internal energy is
A) 1 – Qcold/ Qhot. B) Q/m. C) Qout/ Win. D) Q - W. E) 1 - Tcold/ Thot.
How do we calculate centripetal acceleration?
a. By calculating the acceleration at several points around the circle and averaging. b. By subtracting two velocity vectors separated by a short time interval. c. By adding two velocity vectors separated by a short time interval. d. By calculating the change in speed. e. By calculating the acceleration at several points around the circle and finding the sum.